High-diffusivity absorption core

Abstract

The utility model relates to the field of disposable hygienic products, in particular to a high-diffusivity absorption core which has the effects of high diffusion speed and high absorption efficiency and comprises a core body, the core body comprises a top layer, a bottom layer and a middle layer distributed between the top layer and the bottom layer, a first absorption material layer is arranged between the top layer and the middle layer, and a second absorption material layer is arranged between the top layer and the middle layer. A first absorption material layer is arranged between the middle layer and the bottom layer and comprises a first absorption material, a second absorption material layer is arranged between the middle layer and the bottom layer and comprises a second absorption material, and the first absorption material comprises a first macromolecule water-absorbent resin particle layer and a first wood pulp fiber layer. The second absorbing material comprises a second macromolecule water-absorbent resin particle layer and a second wood pulp fiber layer, and at least one first slit without the first absorbing material is formed in a first absorbing area of the first absorbing material layer in the longitudinal direction; the second absorbing area of the first absorbing material layer is provided with at least one second slit which does not contain the first absorbing material in the longitudinal direction.

Description

Technical Field

[0001] The utility model relates to the field of disposable sanitary products, in particular to a high-diffusivity absorption core. Background Art

[0002] Absorbent cores are widely used in care absorbent products such as diapers and sanitary napkins. The absorbent core should be able to retain liquid for a long time, such as overnight use of diapers, minimize back-seepage to keep the wearer dry, and avoid dirty clothes or sheets. The absorbent core that is widely used on the market is composed of a double-layer or three-layer non-woven fabric with a polymer absorbent resin material sandwiched between the two layers. The polymer absorbent resin material is spread on the upper surface of one layer of the non-woven fabric, and then composited with another layer of non-woven fabric by spraying glue. The thickness of this absorbent core is relatively thin, but the polymer absorbent resin material is not easy to fix, which can easily cause the polymer absorbent resin material to deviate or leak. At the same time, the polymer absorbent resin material absorbs water quickly, and swells after absorbing liquid, and the volume increases to more than ten times its original volume, so that the polymer absorbent resin material in the upper part is easy to hinder the liquid from seeping after preferentially absorbing liquid and swelling, which seriously affects the water absorption efficiency. Utility Model Content

[0003] Therefore, in view of the above problems, the utility model provides a high-diffusivity absorption core with fast diffusion speed and high absorption efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A high-diffusivity absorbent core, comprising a core body, wherein the core body has a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, wherein the longitudinal length of the core body is 5 cm to 80 cm, wherein the core body has a front waist region, a rear waist region and a crotch region distributed in sequence along the longitudinal direction, wherein the core body has a first absorbent region located on one transverse side of a transverse central axis and a second absorbent region located on the other transverse side of the transverse central axis, wherein the core body comprises a top layer, a bottom layer and an intermediate layer distributed between the top layer and the bottom layer, wherein the gram weights of the top layer, the bottom layer and the intermediate layer are 5 gsm to 30 gsm;

[0006] A first absorbent material layer is provided between the top layer and the middle layer, the first absorbent material layer includes the first absorbent material, a second absorbent material layer is provided between the middle layer and the bottom layer, the second absorbent material layer includes the second absorbent material, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the first absorbent material includes a first polymer water-absorbent resin particle layer and a first wood pulp fiber layer, the second absorbent material includes a second polymer water-absorbent resin particle layer and a second wood pulp fiber layer, the average gram weight of the first polymer water-absorbent resin particle layer and the second polymer water-absorbent resin particle layer are both 0.1g / m² to 20g / m², the first absorbent area of ​​the first absorbent material layer is provided with at least one first slit that does not contain the first absorbent material along the longitudinal direction, and the second absorbent area of ​​the first absorbent material layer is provided with at least one second slit that does not contain the first absorbent material along the longitudinal direction;

[0007] The top layer and the middle layer are compositely connected at the first slit and the second slit. When the first absorbent material swells, the first slit of the first absorbent region and the second slit of the second absorbent region form a first guide channel.

[0008] Furthermore, the first absorption zone of the second absorption material layer is provided with at least one third slit not containing the second absorption material along the longitudinal direction, and the second absorption zone of the second absorption material layer is provided with at least one fourth slit not containing the second absorption material along the longitudinal direction, and the bottom layer and the middle layer are compositely connected at the third slit and the fourth slit, and when the second absorption material swells, the third slit of the first absorption zone and the fourth slit of the second absorption zone form a second guide channel.

[0009] Furthermore, the orthographic projections of the first flow guiding channel and the second flow guiding channel coincide with each other.

[0010] Furthermore, the orthographic projections of the first flow guiding channel and the second flow guiding channel are staggered in the lateral direction.

[0011] Furthermore, the longitudinal length dimension of the first absorbent material layer is smaller than the longitudinal length dimension of the second absorbent material layer.

[0012] Furthermore, the front end of the first guide channel is communicated with the front edge.

[0013] Furthermore, the rear end of the first guide channel is communicated with the rear edge.

[0014] Furthermore, the first absorbent material layer is distributed in the front waist area and the crotch area.

[0015] Furthermore, the first slit and the second slit are symmetrically distributed along the transverse center axis of the core body.

[0016] A high-diffusivity absorbent core, comprising a core body, wherein the core body has a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, wherein the longitudinal length of the core body is 5 cm to 80 cm, wherein the core body has a front waist region, a rear waist region and a crotch region distributed in sequence along the longitudinal direction, wherein the core body has a first absorbent region located on one transverse side of a transverse central axis and a second absorbent region located on the other transverse side of the transverse central axis, wherein the core body comprises a top layer, a bottom layer and an intermediate layer distributed between the top layer and the bottom layer, wherein the gram weights of the top layer, the bottom layer and the intermediate layer are 5 gsm to 30 gsm;

[0017] A first absorbent material layer is provided between the top layer and the middle layer, the first absorbent material layer includes a first absorbent material mixed with polymer water-absorbing resin particles and wood pulp fibers, a second absorbent material layer is provided between the middle layer and the bottom layer, the second absorbent material layer includes a second absorbent material mixed with polymer water-absorbing resin particles and wood pulp fibers, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the average gram weight of the polymer water-absorbing resin particles is 0.1g / m² to 20g / m², the first absorbent area of ​​the first absorbent material layer is provided with at least one first slit not containing the first absorbent material along the longitudinal direction, and the second absorbent area of ​​the first absorbent material layer is provided with at least one second slit not containing the first absorbent material along the longitudinal direction;

[0018] The top layer and the middle layer are compositely connected at the first slit and the second slit. When the first absorbent material swells, the first slit of the first absorbent region and the second slit of the second absorbent region form a first guide channel.

[0019] By adopting the above-mentioned technical scheme, the beneficial effects of the utility model are as follows: the high-diffusivity absorbent core body improves the absorption capacity of the core body by means of the first absorbent material layer containing the first absorbent material arranged between the top layer and the middle layer and the second absorbent material layer containing the second absorbent material arranged between the bottom layer and the middle layer, and at the same time isolates the first absorbent material and the second absorbent material through the middle layer, and the first absorbent material includes a first polymer water-absorbent resin particle layer and a first wood pulp fiber layer, and the second absorbent material includes a second polymer water-absorbent resin particle layer and a second wood pulp fiber layer, so that after the wood pulp fibers are glued to the top layer or the bottom layer, the softness of the top layer or the bottom layer is increased, and the thickness and bulkiness are ensured, and after the first polymer water-absorbent resin particle layer or the second polymer water-absorbent resin particle layer is added, the polymer water-absorbent resin particles are embedded in the gaps between the wood pulp fibers, and are fixed to the top layer or the bottom layer through the wood pulp fibers. The sub-absorbent resin particles form a constraint, so that the high-molecular water-absorbent resin particles are fixed, and sufficient expansion space is provided for them to ensure the absorption amount of the high-molecular water-absorbent resin particles, and the first absorption area and the second absorption area of ​​the first absorption material layer are respectively provided with a first slit and a second slit that do not contain the first absorbent material, and the top layer and the middle layer are compositely connected at the first slit and the second slit, so as to encapsulate the high-molecular water-absorbent resin particles and prevent excessive high-molecular water-absorbent resin particles from leaking to the first slit and the second slit. When in use, liquid is absorbed by the first absorbent material, and the high-molecular water-absorbent resin particles in the first absorbent material absorb liquid and swell, so that a first guide channel is formed at the first slit and the second slit, and a part of the excess liquid seeps through the middle layer to the second absorbent material and is absorbed by it, and the other part is guided to flow along the first guide channel, and the guide effect is good, thereby improving the diffusion and absorption efficiency of the core body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the top view of the structure of the first embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0022] Figure 3 It is a cross-sectional structural schematic diagram of the second embodiment of the utility model;

[0023] Figure 4 It is a cross-sectional structural schematic diagram of the third embodiment of the present utility model;

[0024] Figure 5 It is a schematic diagram of the top view of the structure of the fourth embodiment of the utility model;

[0025] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure at the middle BB;

[0026] Figure 7 This is a schematic diagram of the top view of the structure of the fifth embodiment of the utility model;

[0027] Figure 8 It is a cross-sectional structural schematic diagram of the sixth embodiment of the utility model;

[0028] Fig. 9 It is a structural schematic diagram of a detection instrument in an embodiment of the utility model;

[0029] Fig.10 It is a schematic diagram of the top view of the water guide plate of the detection instrument in the embodiment of the utility model. DETAILED DESCRIPTION

[0030] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0031] The utility model embodiment is: Embodiment 1

[0032] refer to Figure 1 and Figure 2 As shown, a high diffusibility absorbent core comprises a core body 1, wherein the core body 1 has a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, the longitudinal length dimension of the core body 1 is 5 cm to 80 cm, preferably 30 cm, the core body 1 has a front waist region 101, a back waist region 102 and a crotch region 103 distributed in sequence along the longitudinal direction, the core body 1 has a first absorbent region 100 located on one transverse side of a transverse central axis a and a second absorbent region 200 located on the other transverse side of the transverse central axis a, the core body 1 comprises a top layer 11, a bottom layer 12 and an intermediate layer 13 distributed between the top layer 11 and the bottom layer 12, and the gram weight of the top layer 11, the bottom layer 12 and the intermediate layer 13 is 5 gsm to 30 gsm;

[0033] A first absorbent material layer is provided between the top layer 11 and the middle layer 13, the first absorbent material layer includes a first absorbent material, a second absorbent material layer is provided between the middle layer 13 and the bottom layer 12, the second absorbent material layer includes a second absorbent material, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends of the longitudinal direction and a left edge and a right edge distributed at both ends of the lateral direction, the first absorbent material includes a first polymer water-absorbent resin particle layer 21 and a first wood pulp fiber layer 22, the first wood pulp fiber layer 22 is close to the top layer 11, the second absorbent material includes a second polymer water-absorbent resin particle layer 31 and a second wood pulp fiber layer 32, the second wood pulp fiber layer 32 is close to the bottom layer 12, the first polymer water-absorbent resin particle layer 21 and the second polymer water-absorbent resin particle layer 31 have an average gram weight of 0.1g / m² to 20g / m², preferably 6 g / m², the first absorption area 100 of the first absorption material layer is provided with at least one first slit 4 free of first absorption material along the longitudinal direction, preferably one, the second absorption area 200 of the first absorption material layer is provided with at least one second slit 5 free of first absorption material along the longitudinal direction, preferably one, the first slit 4 and the second slit 5 are symmetrically distributed along the transverse central axis a of the core body;

[0034] The top layer 11 and the middle layer 13 are compositely connected at the first slit 4 and the second slit 5. When the first absorbent material swells, the first slit 4 of the first absorption area 100 and the second slit 5 of the second absorption area 200 form a first guide channel 6.

[0035] In the present embodiment, the top layer 11, bottom layer 12 and middle layer 13 are all water-permeable nonwoven fabrics, and certainly can also be, for example, tissue paper (air-permeable felt or wet-laid), which has a range of, for example, 5 to 100gsm, specifically a basis weight of 10 to 40gsm. The top layer 11, bottom layer 12 and middle layer 13 can also be formed by a low basis weight nonwoven web with a grammage between 5gsm and 30gsm, such as a carded nonwoven, a spunbond nonwoven or a melt-blown nonwoven and a laminate of any of these webs. For example, a melt-spun polypropylene nonwoven fabric, and has a basis weight range of about 5gsm to 20gsm. Nonwoven materials are typically inherently hydrophobic, and the top layer 11 can therefore be treated to make it hydrophilic, for example, by treating it with a surfactant or other methods known in the art. The top layer 11, bottom layer 12 and middle layer 13 can be made of the same or different materials, optionally treated in different ways to make the top layer 11 more hydrophilic than the bottom layer 12, or paper, tissue, film, woven fabric or a laminate of any of these can also be used.

[0036] The high-diffusivity absorbent core improves the absorption capacity of the core body 1 by providing a first absorbent material layer containing a first absorbent material between the top layer 11 and the middle layer 13 and a second absorbent material layer containing a second absorbent material between the bottom layer 12 and the middle layer 13. At the same time, the first absorbent material and the second absorbent material are isolated by the middle layer 13. The first absorbent material includes a first polymer water-absorbent resin particle layer 21 and a first wood pulp fiber layer 22. The first wood pulp fiber layer 22 is close to the top layer 11. The second absorbent material includes a second polymer water-absorbent resin particle layer 31 and a second wood pulp fiber layer 32. The second wood pulp fiber layer 32 is close to the bottom layer 12. After the wood pulp fibers are glued to the top layer 11 or the bottom layer 12, the softness of the top layer or the bottom layer is increased, and the thickness and bulkiness are ensured. After adding the first polymer water-absorbent resin particle layer 21 or the second polymer water-absorbent resin particle layer 31, the polymer water-absorbent resin particles are embedded in the gaps between the wood pulp fibers and are fixed to the top layer through the wood pulp fibers. Or the bottom layer constrains the polymer water-absorbent resin particles so that the polymer water-absorbent resin particles are fixed and provide sufficient expansion space for them to ensure the absorption amount of the polymer water-absorbent resin particles, and the first absorption area 100 and the second absorption area 200 of the first absorption material layer are respectively provided with a first slit 4 and a second slit 5 that do not contain the first absorption material, and the top layer 11 and the middle layer 13 are compositely connected at the first slit 4 and the second slit 5, so as to encapsulate the polymer water-absorbent resin particles and prevent excessive polymer water-absorbent resin particles from leaking to the first slit 4 and the second slit 5. When in use, liquid is absorbed by the first absorption material, and the polymer water-absorbent resin particles in the first absorption material absorb liquid and swell, so that a first guide channel 6 is formed at the first slit 4 and the second slit 5, and a part of the excess liquid seeps down to the second absorption material through the middle layer 13 and is absorbed by it, and the other part is guided to flow along the first guide channel 6, and the guide effect is good, thereby improving the diffusibility and absorption efficiency of the core body 1.

[0037] Furthermore, the first absorption zone 100 of the second absorption material layer is provided with at least one third slit 7 not containing the second absorption material along the longitudinal direction, preferably one, and the second absorption zone 200 of the second absorption material layer is provided with at least one fourth slit 8 not containing the second absorption material along the longitudinal direction, preferably one, and the bottom layer 12 and the middle layer 13 are compositely connected at the third slit 7 and the fourth slit 8. When the second absorption material swells, the third slit 7 of the first absorption zone 100 and the fourth slit 8 of the second absorption zone 200 form a second guide channel 9, and the first guide channel 6 coincides with the orthographic projection of the second guide channel 9.

[0038] When in use, the liquid is absorbed by the first absorbent material, and the polymer water-absorbent resin particles in the first absorbent material absorb the liquid and swell, so that a first guide channel 6 is formed at the first slit 4 and the second slit 5, and a part of the excess liquid seeps through the middle layer 13 to the second absorbent material and is absorbed, and the polymer water-absorbent resin particles in the second absorbent material absorb the liquid and swell, so that a second guide channel 9 is formed at the third slit 7 and the fourth slit 8, and the other part is guided to flow along the second guide channel 9, and the guide effect is good, further improving the diffusibility and absorption efficiency of the core body 1.

[0039] Furthermore, the peripheries of the top layer 11 , the bottom layer 12 , and the middle layer 13 , as well as the first guide channel 6 and the second guide channel 9 are bonded by spraying glue, or by thermal pressing or ultrasonic welding. Embodiment 2

[0040] In the above embodiment, the first wood pulp fiber layer 22 is close to the top layer 11, and the second wood pulp fiber layer 32 is close to the bottom layer 12. Of course, it can also be set as reference. Figure 3 As shown, the first wood pulp fiber layer 22 is close to the top layer 11, and the second wood pulp fiber layer 32 is close to the middle layer 13. Such a design allows the first polymer water-absorbent resin particle layer 21 and the second polymer water-absorbent resin particle layer 31 to be separated by the middle layer 13 and the second wood pulp fiber layer 32, so that the expansion space of the first polymer water-absorbent resin particle layer 21 and the second polymer water-absorbent resin particle layer 31 is increased, and the second wood pulp fiber layer 32 can form a lateral diversion effect, thereby further improving the utilization rate of the polymer water-absorbent resin particles; or, the first wood pulp fiber layer 22 is close to the middle layer 13, and the second wood pulp fiber layer 32 is close to the bottom layer 12; or, the first wood pulp fiber layer 22 and the second wood pulp fiber layer 32 are both close to the middle layer 13.

[0041] In addition, the top layer 11 has pleated portions 10 on both lateral sides, which are folded in sequence by two folding plates when the top layer 11 is continuously conveyed, and can provide a larger water absorption and expansion space for the polymer water-absorbing resin particles, thereby increasing the absorption capacity of the polymer water-absorbing resin particles. Embodiment 3

[0042] In the above embodiment, the orthographic projections of the first guide channel 6 and the second guide channel 9 coincide with each other. Figure 4 As shown, the orthographic projections of the first guide channel 6 and the second guide channel 9 are staggered in the lateral direction. This structure enables the second guide channel 9 to provide a certain guide effect when there is too much liquid, and improves the air permeability, thereby improving the comfort of use. Embodiment 4

[0043] refer to Figure 5 and Figure 6 As shown, the longitudinal length dimension of the first absorbent material layer is smaller than that of the second absorbent material layer, the first absorbent material layer is distributed in the front waist area 101 and the crotch area 103, and the rear end of the first guide channel 6 is connected with the rear edge, so that the liquid flowing in the first guide channel 6 can overflow through the rear end into the second absorbent material layer, thereby improving the absorption speed. At the same time, the first absorbent material layer is distributed in the front waist area 101 and the crotch area 103 according to the actual use area, which can reduce the use amount of the first absorbent material and ensure that the change of the absorption amount is small, thereby improving the utilization rate of the first absorbent material and reducing the production cost.

[0044] It is disclosed above that the rear end of the first flow guiding channel 6 is communicated with the rear edge. Of course, it can also be arranged that: the front end of the first flow guiding channel 6 is communicated with the front edge. Embodiment 5

[0045] refer to Figure 7 As shown, the number of the first slit 4, the second slit 5, the third slit 7 and the fourth slit 8 mentioned above are all one. Of course, it can also be: the first absorption area 100 of the first absorption material layer is provided with more than two first slits 4 that do not contain the first absorption material along the longitudinal direction, the second absorption area 200 of the first absorption material layer is provided with more than two second slits 5 that do not contain the first absorption material along the longitudinal direction, the first absorption area 100 of the second absorption material layer is provided with more than two third slits 7 that do not contain the second absorption material along the longitudinal direction, and the second absorption area 200 of the second absorption material layer is provided with more than two fourth slits 8 that do not contain the second absorption material along the longitudinal direction. For example, the number of the first slit 4, the second slit 5, the third slit 7 and the fourth slit 8 are all four, and they are spaced apart in the longitudinal direction, so that the formed first guide channel 6 and the second guide channel 9 can play a guiding role, and at the same time can further limit the movement of the polymer water-absorbing resin particles, improve the uniformity of the core body, and ensure the guiding effect of the core body 1.

[0046] Furthermore, the first absorbent material layer and the second absorbent material layer of the core body 1 have a pressurized absorption capacity measured under a pressure of 4.136 KPa of not less than 8.4 g / g, preferably 8.4 g / g or 8.6 g / g or 8.7 g / g or even higher; the first absorbent material layer and the second absorbent material layer of the core body 1 have a water absorption speed measured under a pressure of 4.136 KPa of not more than 10 s, preferably 10 s or 9 s or 8 s or even less. Embodiment 6

[0047] refer to Figure 8As shown, a high diffusibility absorbent core comprises a core body 1, wherein the core body 1 has a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, the longitudinal length dimension of the core body 1 is 5 cm to 80 cm, preferably 30 cm, the core body 1 has a front waist region 101, a back waist region 102 and a crotch region 103 distributed in sequence along the longitudinal direction, the core body 1 has a first absorbent region 100 located on one transverse side of a transverse central axis a and a second absorbent region 200 located on the other transverse side of the transverse central axis a, the core body 1 comprises a top layer 11, a bottom layer 12 and an intermediate layer 13 distributed between the top layer 11 and the bottom layer 12, and the gram weight of the top layer 11, the bottom layer 12 and the intermediate layer 13 is 5 gsm to 30 gsm;

[0048] A first absorbent material layer is provided between the top layer 11 and the middle layer 13, the first absorbent material layer includes a first absorbent material mixed with polymer water-absorbing resin particles and wood pulp fibers, a second absorbent material layer is provided between the middle layer 13 and the bottom layer 12, the second absorbent material layer includes a second absorbent material mixed with polymer water-absorbing resin particles and wood pulp fibers, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the average gram weight of the polymer water-absorbing resin particles is 0.1 g / m² to 20 g / m², preferably 6 g / m², the first absorbent area 100 of the first absorbent material layer is provided with at least one first slit 4 not containing the first absorbent material along the longitudinal direction, preferably one, the second absorbent area 200 of the first absorbent material layer is provided with at least one second slit 5 not containing the first absorbent material along the longitudinal direction, preferably one, the first slit 4 and the second slit 5 are symmetrically distributed along the transverse central axis a of the core body;

[0049] The top layer 11 and the middle layer 13 are compositely connected at the first slit 4 and the second slit 5. When the first absorbent material swells, the first slit 4 of the first absorption area 100 and the second slit 5 of the second absorption area 200 form a first guide channel 6.

[0050] refer to Fig. 9 and Fig.10 As shown, the detection method:

[0051] 1. Prepare instruments:

[0052] Compact block 201: The mass of the compact block 201 is 0.4136 kg, the bottom surface of the compact block 201 is a circular structure, and an electrode is provided inside the compact block 201;

[0053] Plastic cylinder 202: the area of ​​the plastic cylinder 202 is 1000.0 mm²±0.5 mm², the height of the plastic cylinder 202 is 60.0 mm±0.5 mm, and a nylon mesh with a pore size of 36 μm is adhered to the bottom of the plastic cylinder 202;

[0054] Metal frame 203: The metal frame 203 has a filter screen;

[0055] Timer 218;

[0056] Water guide plate 204: A through hole 205 is provided in the middle of the water guide plate 204, and a water pipe joint 206 is connected to the through hole 205. Six water guide grooves 207 are concavely provided on the upper surface of the water guide plate 204 along its radial direction;

[0057] Water pumping system: The water pumping system includes a water pump 208 and a water pipe 209 connected to the water pump 208;

[0058] Water tank 210: The water tank 210 has a water storage chamber 211. A baffle plate 213 in an annular structure is provided on the upper surface of the water tank 210. A water guide chamber 212 is formed between the baffle plate 213 and the water tank 210. A water outlet hole 214 and an overflow hole 215 are provided on the upper surface of the water tank 210, which communicate with the water storage chamber 211 and the water guide chamber 212.

[0059] Bracket 216;

[0060] Lifting assembly 217;

[0061] Balance;

[0062] The water pump 208 is arranged in the water storage chamber 211, the bracket 216 is horizontally mounted on the baffle 213, the metal frame 203 is arranged on the bracket 216, and is used to place the plastic cylinder 202, the lifting component 217 is arranged on the water guide chamber 212, the water guide plate 204 is arranged at the upper end of the lifting component 217, and is distributed on the lower side of the metal frame 203, the water pipe 209 passes through the water outlet hole 214 and is connected to the water pipe joint 206 of the water guide plate 204, and the timer 218 is connected to the electrode of the pressing block 201 and the metal frame 203 through the wire 219.

[0063] 2. Testing steps:

[0064] a. Carry out the test under the standard atmospheric pressure;

[0065] b. Weigh 9.0 g of sodium chloride in a beaker, transfer it to a 1 L volumetric flask after dissolving it, dilute it with water to the scale and shake it well to prepare a 0.9% saline solution, and inject the saline solution into the water storage chamber 211 of the water tank 210;

[0066] c. Prepare 5 pieces of absorbent bodies with an area of ​​(50±0.2) mm*(80±0.2) mm as samples, carefully extract wood pulp fibers and polymer water-absorbing resin particles from the core body 1, for example, by carefully shaking or sucking, and use a freezing spray to separate the top layer 11, the bottom layer 12 and the middle layer 13 from each other and then peel off the wood pulp fibers and the polymer water-absorbing resin particles. The samples should be kept at 21°C±2°C and 50%±20%RH for at least 24 hours to reach equilibrium;

[0067] d. Put the wood pulp fibers and polymer water-absorbing resin particles peeled off from a single sample into a plastic cylinder 202 and compact them to form a block sample, and weigh the dry sample with a balance, which is recorded as dry weight m1;

[0068] e. Place the plastic cylinder 202 connected to the sample on the metal frame 203, and weigh the dry sample and the dry test module (plastic cylinder 202 and metal frame 203) with a balance, and record it as dry weight m2;

[0069] f. Gently place the pressing block 201 on the top of the sample and let it stand for 30 seconds. Then, lift the water guide plate 204 through the lifting assembly 217 so that the water guide plate 204 is against the metal frame 203.

[0070] g. Start the water pump system and inject physiological saline into the plastic cylinder 202. When the surface of the physiological saline contacts the filter screen of the metal frame 203, the timer 218 starts. After the physiological saline completely permeates the sample, the built-in electrodes on the pressing block 201 are turned on and the timer 218 stops timing. At this time, the reading of the timer 218 is the water absorption speed of the sample.

[0071] h. After the water absorption time measurement is completed, the water pumping system continues to pump water for 10 seconds, then the water pump 208 is turned off, the water level is lowered, and the level of the physiological saline drops below the filter screen of the metal frame 203. The soaked sample begins to drain under the action of the pressing block 201. After 30 seconds of drainage, the pressing block 201 is removed, and the soaked sample and the test module are measured with a balance, which is recorded as the wet weight m3;

[0072] i. Take another set of dry test modules, repeat steps d, e, f, g, and h, and measure the wet test modules with a balance, which is recorded as wet weight m4;

[0073] j. Calculate the pressure absorption of the sample K = ((m3-m2)-(m4-(m2-m1))) / m1;

[0074] k. Repeat the above steps five times and take the average value.

[0075] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A highly diffusible absorbent core, characterized in that: The core body is defined as having a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, the longitudinal length dimension of the core body is 5 cm to 80 cm, the core body has a front waist region, a back waist region and a crotch region distributed in sequence along the longitudinal direction, the core body has a first absorption region located on one transverse side of the transverse central axis and a second absorption region located on the other transverse side of the transverse central axis, the core body comprises a top layer, a bottom layer and an intermediate layer distributed between the top layer and the bottom layer, and the gram weight of the top layer, the bottom layer and the intermediate layer is 5 gsm to 30 gsm; A first absorbent material layer is provided between the top layer and the middle layer, the first absorbent material layer includes the first absorbent material, a second absorbent material layer is provided between the middle layer and the bottom layer, the second absorbent material layer includes the second absorbent material, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the first absorbent material includes a first polymer water-absorbent resin particle layer and a first wood pulp fiber layer, the second absorbent material includes a second polymer water-absorbent resin particle layer and a second wood pulp fiber layer, the average gram weight of the first polymer water-absorbent resin particle layer and the second polymer water-absorbent resin particle layer are both 0.1g / m² to 20g / m², the first absorbent area of ​​the first absorbent material layer is provided with at least one first slit that does not contain the first absorbent material along the longitudinal direction, and the second absorbent area of ​​the first absorbent material layer is provided with at least one second slit that does not contain the first absorbent material along the longitudinal direction; The top layer and the middle layer are compositely connected at the first slit and the second slit. When the first absorbent material swells, the first slit of the first absorbent region and the second slit of the second absorbent region form a first guide channel.

2. The highly diffusible absorbent core according to claim 1, characterized in that: The first absorption zone of the second absorption material layer is provided with at least one third slit not containing the second absorption material along the longitudinal direction, and the second absorption zone of the second absorption material layer is provided with at least one fourth slit not containing the second absorption material along the longitudinal direction. The bottom layer and the middle layer are compositely connected at the third slit and the fourth slit. When the second absorption material swells, a second guide channel is formed at the third slit of the first absorption zone and the fourth slit of the second absorption zone.

3. The highly diffusible absorbent core according to claim 2, characterized in that: The orthographic projections of the first flow guiding channel and the second flow guiding channel coincide with each other.

4. The highly diffusible absorbent core according to claim 2, characterized in that: The orthographic projections of the first flow guiding channel and the second flow guiding channel are staggered in the transverse direction.

5. The highly diffusible absorbent core according to claim 3 or 4, characterized in that: The longitudinal length dimension of the first layer of absorbent material is smaller than the longitudinal length dimension of the second layer of absorbent material.

6. The highly diffusible absorbent core according to claim 5, characterized in that: The front end of the first guide channel is communicated with the front edge.

7. The highly diffusible absorbent core according to claim 5, characterized in that: The rear end of the first flow guiding channel is communicated with the rear edge.

8. The highly diffusible absorbent core according to claim 7, characterized in that: The first absorbent material layer is distributed in the front waist region and the crotch region.

9. The highly diffusible absorbent core according to claim 1, characterized in that: The first slit and the second slit are symmetrically distributed along the transverse center axis of the core body.

10. A highly diffusible absorbent core, characterized in that: The core body is defined as having a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, the longitudinal length dimension of the core body is 5 cm to 80 cm, the core body has a front waist region, a back waist region and a crotch region distributed in sequence along the longitudinal direction, the core body has a first absorption region located on one transverse side of the transverse central axis and a second absorption region located on the other transverse side of the transverse central axis, the core body comprises a top layer, a bottom layer and an intermediate layer distributed between the top layer and the bottom layer, and the gram weight of the top layer, the bottom layer and the intermediate layer is 5 gsm to 30 gsm; A first absorbent material layer is provided between the top layer and the middle layer, the first absorbent material layer includes a first absorbent material mixed with polymer water-absorbing resin particles and wood pulp fibers, a second absorbent material layer is provided between the middle layer and the bottom layer, the second absorbent material layer includes a second absorbent material mixed with polymer water-absorbing resin particles and wood pulp fibers, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the average gram weight of the polymer water-absorbing resin particles is 0.1g / m² to 20g / m², the first absorbent area of ​​the first absorbent material layer is provided with at least one first slit not containing the first absorbent material along the longitudinal direction, and the second absorbent area of ​​the first absorbent material layer is provided with at least one second slit not containing the first absorbent material along the longitudinal direction; The top layer and the middle layer are compositely connected at the first slit and the second slit. When the first absorbent material swells, the first slit of the first absorbent region and the second slit of the second absorbent region form a first guide channel.

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